Our connecting pipe is for R410a, can it be used for R407c?

Where did you find a freon called R407c. I have never heard of it and I can not find any information about it.

The refrigerant R407C is widely used in air-condtioner. It's a hydrofluorocarbon (HFC). HFCs, when in use are not harmful to the ozone layer but do have a high global warming potential and hence are harmful to the environment.

Yeah, it's used in Europe and China a lot...