I think these are same with Heidenau K60, are they?

I just fitted some K60s today, but I'm 99% sure Mefo Explorers are just a different marketing for Heidenau K60...

Anyway, for the moment i only did 5km or so back home on tarmac and compared to the Siracs i had before they seem to make the handlebar wobble a lot around 4000 rpm, on the siracs I could go no hands a lot but doesn't seem that's possible with the K60.

Might have something to do with the fact that I changed them myself and the back had some issues setting properly on the rim. I haven't balanced the wheels either after fitting but might do it on Monday.