OMG, this is basic stuff. Simply put, not all ac have a rad alt. it is the equivalent minima if you have qfe set. The end
JT2 got it right. People seem to be confusing company policy for use of the radalt with the legal requirements.
I'm surprised there is so much uncertainty about this. There is no requirement for an IFR equipped aircraft to carry a radalt. It isn't taken into consideration as far as the procedure design is concerned; back when most approaches were designed, radalts weren't in widesepread use and there certainly has been no change to the way the minima are published, at least not over the last thirty eight years or so that I've been flying for a living.
Despite what company policy requires, it needs to be borne in mind that radalts can suffer "unlocks" for a variety of reasons and should only be used for supplementary information during letdowns to airfields.