Merge Database MySQL files

[dnlcrafts]

Is it possible to merge 2 database MySQL files (crasales_zc1 and _zc2) from 2 different domains on the same server? I would want to merge into zc2. zc1 site uses zen 1.3.9 (really messed up trying to upgrade) and zc2 used zen 1.5.0. I would then forward the messed up domain to the good one. What would the merge do to the good site? would my products from the messed up site show on the good site. What files would I have to change? So many questions and so little knowledge.

I have researched the forum and tried all kinds of fixes for the 1.3.9 site for 4 days and the aheader I go the behinder I get. If I can merge the two that would work much better than trying to keep up 2 sites. Any one have any answers on this, I sure do not want to have to have to physically enter all the products from 1.3.9 site into the 1.5.0 site.