You should look at
Tenish's quests, for general idea of armor. It's basically the same level, give or take, as Qvic quested gear to get some idea.
Ten levels is a huge difference, even without equipment upgrades. For the same mob, you will resist their spells more often and your's will get resisted less. They will hit you less often, and you will hit more often. Some of your stats will be higher, and all of them will be with equipment upgrades and skill ups.
Much of PoP pre-EP is solo-able easily, even many names. I'd guess even without raid gear, most pre-EP PoP bosses are 1-groupable. Definitely it is with Anguish level gear.
AAs make a world of difference too, eventhough the biggest impacting ones are from the PoP tabs, the newer AAs still add to them, and AAs are pretty easy to get at any level now, due to the changes in the AA system.
There have been so many game changes, that I'm finding it very difficult not to speak in generalities, which is very annoying. But I doubt you can find any specifics comparisons, on such a general topic. Also, I don't generally go looking for easy content, but rather difficult but potentially do-able content, unless I'm just grinding, and then it's more about how long are we gonna grind for to determine the difficulty level we want. Very long grinds require much safer (easier) content, as after 8+hrs no one want to pay attention as much to the game or work as hard. It is then more about keeping it smooth, and enjoying the company.
Small raids could probably do alot of GoD content without raid level gear at 75.
There is so much new content you can do also, alot of which can be done with groups, or small raids. DoN progression for example, which gives some nice AAs. There first one being +10 to all stats and +10 to all stat caps. There is so much more, but you asked about old content, so I'll leave it at that single example.
Yther Ore.