Yes, in addition to the film, different paperstocks can have different exposure times for contact and projection prints, and further beware that different papers respond differently to contrast filtration. Most of my printing is done with Ilford contrast filters on Ilford MG paper.
Originally Posted by gonzo74
Anyway, if you do the contact prints using a #2 filter, then you get some idea what filter you need for your projection print (more or less contrast), so it's helpful. Also, if contact prints are excessively flat, then maybe increase your film development time. If too dark, maybe increase your film exposure time (in-camera). Contact prints can be very helpful from one end to the other.
To see what different filmstocks do, take a sections of unexposed film (developed & fixed so you see "base fog") of different types, lay them up for contact printing, then do a step test (t, 2t, 3t, 4t,...) and you'll notice that some filmstocks get to maximum black faster than others.
But you are right, different papers will respond differently and a survey of those you use would prove helpful.
I know this sounds like a lot of dicking around for just contact prints, but this sort of craftwork pays back enormously when it comes to acheiving repeatability and reliability in exposure, film development, and of course, the whole point, the final printing.
I'm in the middle of this, too.