In general each EU2 province ID can correspond to multiple Victoria IDs, but I have arranged it in such a way that each two EU2 IDs can never map to the same Victoria ID. Unfortunely this means that in your case where 2 EU2 provinces would correspond to one Victoria province, you have two options:
1. Ignore to add one of the EU2 provinces. The converter will be smart enough to disregard this and continue as usual. If you really do need to remove one EU2 ID, please comment about it in the province data file, and also please remove the most unimportant province. By that I mean that a province which can have a capital of a country is considered important, while a crappy low-income province that can never be a capital is unimportant.
2. Assign the less important EU2 ID to some other Victoria province ID that it really shouldn't link to.
1. Ignore to add one of the EU2 provinces. The converter will be smart enough to disregard this and continue as usual. If you really do need to remove one EU2 ID, please comment about it in the province data file, and also please remove the most unimportant province. By that I mean that a province which can have a capital of a country is considered important, while a crappy low-income province that can never be a capital is unimportant.
2. Assign the less important EU2 ID to some other Victoria province ID that it really shouldn't link to.