Is there any difference between NIST and SECP curves in-terms of their algorithms and implementation?
Please check https://tools.ietf.org/search/rfc4492 - espessially, the "Appendix A.  Equivalent Curves (Informative)" part. 

For example: NIST P-256 is refered to as secp256r1 and prime256v1. Different names, but they are all the same.