Oh - I wasn't trying to be snarky, just didn't make the connection. Still have no experience with it.
FYI, all is good. It wasn’t taken that way at all. I should have stated “perhaps the OP means plunge router”, sorry.
I too don’t know for sure if the older dremel attachments will fit the newer roto-tools. My guess is they probably don’t by the shape of the bodies appearing to be different. However the manuals for the attachments should indicate which dremel series they fit, best to check online if you no longer have them.
If it was me and I had a lot invested in attachments that would not fit a newer replacement Dremel, I would attempt to repair the old one, or if too far gone, look for a replacement that does fit. There may be some good bargains out there for an older model dremel NOS.
Check these out for parts.
https://www.ereplacementparts.com/dremel-parts-c-15440.htmlAlso checkout “You-Tube” university, there are a bunch of instructional videos showing how to fix these things.
Hope this helps some.
Good luck.