Well you can do such thing
single.php :
<?php
$single_type = get_field("single_type");
if( $single_type == 'type1' ) {
get_template_part("type1");
} else {
get_template_part("type2");
}
?>
You should create type1.php and type2.php files in your theme directory.
I hope it is what you want to create.
