Difference in "MX204" and "MX204-HW-BASE"?

Richard just reports the news, and at risk of keeping this thread a live, I 
thought I'd give our real word experiences.

I've upgraded both newer "licensed based" mx204s and perpetual pre-sku-change 
mx204's to 22.4.  I can attest regardless I had no problems with BGP or 
anything else.  All of my chassis, licensed or not, claim to be missing 
licenses based on the output of 'show system license'.   For all of my chassis, 
there are/were  no chassis alarm indicating a problem, nor did I receive any 
syslogs indicating a missing license.

So calling the enforcement soft seems to be an understatement; I had to go out 
of my way to find out JunOS things I'm breaking the rules.  

We had purchased the activation codes for the licensed based mx204s that I sat 
on until 22.4, so I went through the Agile licensing portal hoops and applied a 
license to the ones that "I know" require a license per their new model

The whole process makes me wonder if I made a mistake and we're one step away 
from being locked out of our network.  Not a great experience.  I will probably 
follow Richard's advice and ask our SE what's supposed to happen "show system 
license" wise to my legacy mx204s.

-Michael