I think it should be comparable. Swk tr has 50 from set + moc (or leve) 25 (or 50) + cc Set (not possible with inna) (for me >50), perma epi 50, stone hands in cube and surely something I forgot. Compared to PoJ where you have cc set but only round 30% rcr = dr it is capable of much more sustainability which is a hughe thing at least for me (my best poj without pushing was 125, sure I can do 127-128 range but not more because of less dmg und dmg red.
Inna has … leve + some + % life + more mantra (mainly allres and a bit life reg). And e.g. LoD was taken over inna (WoL both) because LoD has 54 DR, can take leve and the ally bracers. Both were pretty near each other but LoD was superior especially because of unity ring and CoE.
I’m sure we need a def ring with you gain 60% dr and this value is lifted to 80% as long as you are not using epi. (80% dr are same as 60% and additional 50% from desert rune). This would help the non epi builds (rainment gen and uliana) on the same way it would help perma epi builds like tr, wol and ltk. Then rainment also needs a dr buff (maybe in form of cc immunity) and uliana as well (first of all the belt should stack and not replace buff before similar to harvester of WD) and some DR on the gear. Devs do not understand that monks are squishyest class. I thing they think you have palace with 55 dr as a skill - but this is on the ground and static. Monks need to move all day long. Maybe an inna dr buff would be tied to life reg such as for any 10k life reg you gain 10% dr or so up to a limit of 60. Its just some brainstorming, I mean the DR ring would not help inna builds since you play inna with travelers set + obsidian, so there needs to be also a 60% dr buff as well.
When trying to balance things, it would be wise to balance LoN / LoD builds on each class first and then adjust the set boni to what you lose when getting set items. and sets should have some specialities. Uliana is one of a real game changer, same to earthquake with the juming jack. It changes the way a build is played. Innas bonus is kind of unique because you gain many mantras. swk, poj and rainment are stupid buffs with sometime questionable 2p or 4p bonusses (ok, rainment 2p is pretty fine with ias of gens and dr on the sets poj and swk is needed but have you ever seen the swk decoy in action?).
Uh, I forgot to mention, that I texted a wall of text a year ago and all is still true, so they did not hear us. If you like those ideas, please add a comment there, such that the probability of hearing us is lifted: