Change WooCommerce Image Size in One Product CAtegory

you could use the filter woocommerce_gallery_thumbnail_size, and inside that function, is when you would use the if ( is_product_category(2295) ) something like:

    add_filter( 'woocommerce_gallery_thumbnail_size', function( $size ) {
    if ( is_product_category(2295) ){
        return 'thumbnail';
        }
    return $size;
    } );

you can check the WooCommerce docs here