I believe there’s actually a plan to make these updated ones the default icons for everyone. 
I’m not 100% sure on the timeline or whether they’ll update existing sites, but I’ll see if I can find out more details. 
Actually… checking out my test site it has the new badge icons already 
I think I’ve been an idiot and clicked on Meta’s badges and not my test site ones Checking again my test site ones appear to still be the old ones. 