Yes im sure it can easily be done. If i was you i would simply join both and then talk to both admins and get them to amalgamate into one, and if they are fighting over the name of the team then they should have the name changed to both Netherlands/Holland.
And if that dont work just offer them sweets to change
I noticed there are two entries in the country list for the netherlands (netherlands and holland). Why are they seperate, can't they be combined to one entry?