3rd gen stock TRD Offroad suspension in a 2nd gen questions

I have a few questions about swapping a 3rd gen TRD Offroad take off suspension into my 2nd gen.
Here are the specifics.
My truck:
2012 TRD Offroad, access cab, 4x2, v6, Automatic

Donor parts truck:
2019 TRD Offraod, double cab, long bed, 4x4, V6, automatic

My questions are:
1) Will the 2019 donor leaf springs work on 2012 - are they a direct bolt in (are double cab, long bed, 4x4 leaf springs different than access cab, 4x2 leaf springs?)
2) Are the UCA's the same on each truck or will I need/want to use the 2019 UCA's to get the maximum benefit. My 2012 UCA are in good shape and don't need to be replaced if not necessary.

Thanks.

 

Just an FYI. I did this with my 2006 and now the truck has a lean. 1/4” drivers front and it is 1” lower on drivers rear. Grrr

 

It’s a straight swap. A lot of threads on this.

 

Straight swap unless it turns out like mine. Not fun