Printing exposure time

[zauhar]

I am perplexed by the variation in print time between matte and glossy finish paper. (I asked about this in another thread, did not see a response.)

Recently, I was futzing with one image on Arista RC variable contrast Matte finish paper, and needed ~40 sec exposure time (enlarger lens at f/16, two minutes developing in 1:2 Dektol, #4 filter).

Next I switched to another image, but using Ilford RC glossy paper. Exposure time is very short (10-15 sec) and results are very sensitive to the time. Other parameters the same except the choice of filter.

Does this sound right to you more experienced folks?

Thanks!

Randy