In the end I find out what works with what, and how...
(The link is slightly NSFW I give a description below)
https://steemit.com/palnet/@joey-fancy/joey-fancy-on-steemit-and-hive-plus-dporn-and-more
The result is:
PALnet, VIT Global, DPorn and Ass Token display Steemit blogs.
PALnet, VIT Global, and Ass Token post to Steemit.
Neoxian City and DPorn display Hive blogs.
Neoxian City and DPorn post to Hive blogs.
Neoxian City and DPorn can be used to make comments on Steemit blogs too.
Steemit blogs from March 19 of 2020 Common Era and before that date can be viewed on all of the above, assuming all proper tags are used for PALnet, Ass Token, Neoxian City, DPorn, and VIT Global.
Over all a win for DPorn with the most compatibility!
Bonus info:
Attempting to comment on a Hive blog from VIT Global (using the trick that allows a Hive blog to appear as VIT page by re-writing the web address) results in an error... but DPorn and Neoxian City can be used to comment on both Hive blogs and Steemit blogs.
Anyway, that's my test for compatibility with Steemit and Hive.
Peace and Long Life, Live Long and Prosper!