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I think they would both be classed as yellow ( which is called something like kita iirc.) The first one is more like the yellow ones I've seen from one of the above mines I think. The blue/grey...

If it's a proper honyama it would probably be from shobou or nakayama iirc but the name is now used as a general term as well. The back is similar to some I've seen from the above but I don't recall...

Since shapton make a number of models of equal grit you can find them at a range of prices. Maybe you'd be best buying one which is slightly slower and cheaper like the m5 in your pics as you'd...