I did just like this : install both and enjoy both...
Both mods are a great job and have their own specificity.
Only harmonization I did so far is sounds (I picked up which ones I preferred + added some of Sailor's Steve ) and also speeds of Uboats to the NYGM standard just for having the same in both versions. Also imported in GWX the 6 dials simfeeling version from Boris and assigned the same control (Ctrl T) to the manual input in the TDC dials appearing in the periscope and UZO views.
PS : a dual install is no problem using MultiSH3