I have ordered I new impeller to my 2010 rxp x 255, (SRZ-CD-15/22R)

After I ordered the part I got a reply mail from the service man I use in Norway that said that it is important that I get a SRX-15/22R Impeller.. I`m a bit worried now. What is the different between these two impellers? Will it fit my 2010 rxp??