Is it possible to equip and use the normal and heroic version of this trinket at the same time?
Yes you can.
Altho you can get only static benefit... "on use" share CD with other one so you can use only one of them in 3 min time frame.
You can look @ it this way.
Double Juggernaut's Vitality
Increases maximum health by 5186 for 15 sec. 3 min CD.
"Takes both trinket slots"
Mookey | GM of <RISE> Xavius [EU]
I have both versions of Vengeance of the Forsaken - Item - World of Warcraft and the stats stack and the on uses do NOT share a cooldown. One trinket will be on temporary cooldown while the other is active which is just like any other 2 trinkets both with on uses.
And yes I know that is WAY too much expertise, I didn't actually pick up these trinkets to use, no one else wanted them and I was hoping to get both specifically to test if they stacked.
From a tanking perspective, assuming you have the heroic 25 man trinket, your next option is likely either:
192 stam from the normal 25 man trinket
Or 162 stam from the Heart of Iron, along with 432 dodge on use for 20 seconds, every 120 seconds.
Trading 30 stam for an average of 72 dodge rating is a huge upgrade in overall itemization value, although admittedly (like most things tanking) is fight dependent. For TOC, because there's quite a bit of magic damage in almost every fight, I'd probably take the extra stam in this case. But it's not cut and dry, and for DPS I suspect most of them time they'll lose quite a bit of overall DPS not taking the on-use.
edit: If it turns out the above poster saying they share a cooldown was incorrect, the point is moot. and.... everyone and their brother will be trying to stack their best in slot trinkets. faaaaaantastic.
Thank god you told us twice.
It was a good clarification since the dps trinkets appear to be different.
The HP trinkets are categorized as Battlemaster Trinkets. It's stupid, and will probably get a change at some point.