diff --git a/src/wp-includes/block-supports/block-style-variations.php b/src/wp-includes/block-supports/block-style-variations.php
index 2e86cb71afc17..4397a34af9701 100644
--- a/src/wp-includes/block-supports/block-style-variations.php
+++ b/src/wp-includes/block-supports/block-style-variations.php
@@ -7,21 +7,6 @@
  * @since 6.6.0
  */
 
-/**
- * Generate block style variation instance name.
- *
- * @since 6.6.0
- * @access private
- *
- * @param array  $block     Block object.
- * @param string $variation Slug for the block style variation.
- *
- * @return string The unique variation name.
- */
-function wp_create_block_style_variation_instance_name( $block, $variation ) {
-	return $variation . '--' . md5( serialize( $block ) );
-}
-
 /**
  * Determines the block style variation names within a CSS class string.
  *
@@ -124,7 +109,7 @@ function wp_render_block_style_variation_support_styles( $parsed_block ) {
 	 */
 	wp_resolve_block_style_variation_ref_values( $variation_data, $theme_json );
 
-	$variation_instance = wp_create_block_style_variation_instance_name( $parsed_block, $variation );
+	$variation_instance = wp_unique_id( $variation . '--' );
 	$class_name         = "is-style-$variation_instance";
 	$updated_class_name = $parsed_block['attrs']['className'] . " $class_name";
 
@@ -230,11 +215,9 @@ function wp_render_block_style_variation_class_name( $block_content, $block ) {
 
 	/*
 	 * Matches a class prefixed by `is-style`, followed by the
-	 * variation slug, then `--`, and finally a hash.
-	 *
-	 * See `wp_create_block_style_variation_instance_name` for class generation.
+	 * variation slug, then `--`, and finally an instance number.
 	 */
-	preg_match( '/\bis-style-(\S+?--\w+)\b/', $block['attrs']['className'], $matches );
+	preg_match( '/\bis-style-(\S+?--\d+)\b/', $block['attrs']['className'], $matches );
 
 	if ( empty( $matches ) ) {
 		return $block_content;
diff --git a/src/wp-includes/deprecated.php b/src/wp-includes/deprecated.php
index 457b7fc136718..be92ba6796c18 100644
--- a/src/wp-includes/deprecated.php
+++ b/src/wp-includes/deprecated.php
@@ -6387,3 +6387,21 @@ function wp_enqueue_global_styles_custom_css() {
 		wp_add_inline_style( 'global-styles', $custom_css );
 	}
 }
+
+/**
+ * Generate block style variation instance name.
+ *
+ * @since 6.6.0
+ * @deprecated 6.7.0 Use `wp_unique_id( $variation . '--' )` instead.
+ *
+ * @access private
+ *
+ * @param array  $block     Block object.
+ * @param string $variation Slug for the block style variation.
+ *
+ * @return string The unique variation name.
+ */
+function wp_create_block_style_variation_instance_name( $block, $variation ) {
+	_deprecated_function( __FUNCTION__, '6.7.0', 'wp_unique_id' );
+	return $variation . '--' . md5( serialize( $block ) );
+}
diff --git a/tests/phpunit/tests/block-supports/wpCreateBlockStyleVariationInstanceName.php b/tests/phpunit/tests/block-supports/wpCreateBlockStyleVariationInstanceName.php
index 1e37d48e8ed1d..10475587287a8 100644
--- a/tests/phpunit/tests/block-supports/wpCreateBlockStyleVariationInstanceName.php
+++ b/tests/phpunit/tests/block-supports/wpCreateBlockStyleVariationInstanceName.php
@@ -13,6 +13,8 @@ class Tests_Block_Supports_WpCreateBlockStyleVariationInstanceName extends WP_Un
 	 * @ticket 61312
 	 *
 	 * @covers ::wp_create_block_style_variation_instance_name
+	 *
+	 * @expectedDeprecated wp_create_block_style_variation_instance_name
 	 */
 	public function test_block_style_variation_instance_name_generation() {
 		$block    = array( 'name' => 'test/block' );