Previous Post & Next Post Links

I am essentially running 2 blogs off of the same URL, although I haven’t installed 2 separate WP databases because my host doesn’t support it.

1 of the blogs is generated by placing the posts in 1 category – and then the archives template has been modified so that the archive index looks like the front page of a blog.

I have used <?php next_post_link(‘%link’, ‘Next post in category’, TRUE ); ?> to put the Previous & Next Post links at the bottom of each post, but for the second blog I am running, there are multiple categories, not just one.

Is it possible to do 1 set of coding for the archive template, and 1 set of coding for the single post template?

Here are the links:
https://gloriafeldt.com/9ways/ (this is the archive index template)
https://gloriafeldt.com/heartfeldtblog/ (this is the single post template)

Thanks for the insight!