2001 Kia Sportage Question: Manual transmission compatibility

I have a 2 wd manual transmission that has gone out. I purchased a used 4wd transmission not including the transfer case. According to the KIA Global website the transmissions are the same with the exception of the 4 wd having a transfer case and the 2 wd having an extension or tail stock in its place. I have found that the rear case of the 4 wd transmission is approx 11" long and the rear case of the 2wd transmission is approx 6 1/4" long not including the tail stock. This does not worry me as I planned to use the rear case and tail stock from my 2 wd transmission. My problem stems from overall measurements of both transmissions. The 2 wd unit from bell housing to the end of the mainshaft measures approx 30 3/4". The 4 wd unit bell housing to mainshaft end measures approx 26 3/8". This tells me that the 2wd mainshaft is approx 4 3/8" longer than the 4 wd mainshaft. The question: Can I use my 2 wd mainshaft, rear case and tail stock with the rest of the 4 wd transmission parts to make a useable 2 wd transmission?