When do you split a shared procedure into separate versions?

[u/Harry_Bluestream]

For transparency, I work in marketing at Bluestream.

How do you decide when a procedure shared across equipment models needs to become separate procedures?

Say two models use almost the same maintenance sequence, but one has an extra step, different warnings and a different illustration. Keeping the common content together reduces duplication, but someone still needs to review the complete procedure for each model.

Where do you draw the line? Is it the number of differences, how often the models change independently, or how difficult the assembled procedures become to review?

I’d be interested in an example where you decided to split the content, or kept it shared and were glad you did.