Yes side gears to accept the front axles would work with the carrier I have. I have a total of 3 diffs. I did not have plans on needing 2 of them (the 2 origionally on the truck) so I did not mark anything and took them all apart.
Here is the newer front carrier i picked up:
Top left is what came out of the front diff housing (Welded and useless side gears.) Top right is the newer carrier. Bottom is my origional rear carrier with large side gears and locker installed.
My best option may be to drop this locked carrier in my rear housing on the truck. Take that carrier out, install a second locker and side gears for front axles. I have to pull my rear axles anyway to fix a seal leak. I can swap out parts with someone for the side gears or just pay either way. TIA