using different loop-index dependant on category

HI,
in my child theme’s single.php I have modified this code:

                        get_template_part( 'includes/loop', 'index' );

to:

if(in_category('current-developments')) {
                        get_template_part( 'includes/loop', 'index' );
				}
				
				 else  {
                        get_template_part( 'includes/loop', 'sub-index' );
				}

This is working fine, I am able to customise the loop for those in the category ‘current-developments’. My issue is I cant figure out how to add multiple categories here, I tried:

if(in_category('current-developments','other-category')) {
                        get_template_part( 'includes/loop', 'index' );
				}
				
				 else  {
                        get_template_part( 'includes/loop', 'sub-index' );
				}

but this didnt work.

Any help would be great!

thanks