Just set both controllers to the same Vabs and time at Vabs and same Float voltage.
With two separate solar sets you have the option of splitting the bank to put your inverter on one and run the rest of the rig on the other like I have posted about elsewhere--if it is any use to you of course. I do have to choose which bank the Trimetric is reading though. ( I have a shunt on each and swap the display as needed, so I don't need two displays the way I do things--YMMV)
Easiest to just put both controllers on the one bank--both controller negs go on the one shunt same as all the other negs.
With different controller to battery wires, they will have different voltage drops and their controller displays will show slightly different voltages, so they won't be exactly in synch for when they think they reach Vabs, but will be "close enough" if you use fat wire for each.
