Tekno v3 8T 1.0 Questions

[Mentat]

hey guys, my Tekno V3 kit came in for my 8T 1.0 race roller, i had been using the losi electric conversion kit till it came. Couple things. First off since it was only 69.99 and they had been outta stock on the kit for my Castle Mamba Monster 2200kv motor, i ordered the 44mm kit instead because i remember that you can send in the mount to get the one you need. Can anyone please confirm this, and or give me the info needed to do this. I have the 44mm need the 42mm or can i use the 44mm on the castle/neu motor?

Next. Since i have to losi electric conversion i was wondering if i should combine certain aspects of each of the kits? example being the CNC'd center diff mount. and the battery tray. etc... Thoughts on what i can use and shouldnt use between the 2 kits? Also what are the major difference between the 8t 1.0 race roller chassis and the tekno v3 chassis? thoughts,suggestions etcc welcome!