The top one is a German bayonet for a K98 mauser, also called the M84/98. It has its frog and has bakalite handles. The bottom one is a Czech VZ24. It has wood grips and has had the barrel ring removed (and rare longs "ears" left) to be used by the Germans on the mauser.
Here's a close-up with the scabbards removed.
They are a very similar design, but there is one very significant difference (not mentioned above). Can anyone spot it?












