RP-SMA and SMA conversion
The only issue with the adapters could be a mechanical one.  They are usually pretty short, so if you don't have good access to the connector it might be difficult to screw it in.  Also, you could run in to an issue where the antenna is screwed on to the adapter and then the adapter gets loose, but you can't unscrew the antenna because the adapter rotates and you can't access the adapter to either tighten it or loosen it.  So if you can access the connector easily even with the antenna installed, the adapter is probably a good option since you already bought the antennas.  Otherwise, it might be a better idea to buy the correct antennas.