there is no castes in sikhi!

caste is something that derives from the pindhs and shehra of India. the gurus abolished this and in its place stands all are sikh; not ramgarhian, not jath, but SIKH!
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/sikh-youth/14462-caste-system-in-sikhism.html
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=14462

So the answer to ur question is easy....yes, no matter what 'caste' you are, you can marry into and out of any caste because as long as you are both Sikh, you will have Guru ji's blessing.