I wouldn't be very confident when OpenSSL could create private key with similar format. For example, here's RSA 512 bit private key generated by OpenSSL.
MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEAwwYIagBPftcHgGHA
q+CMqbP3dE0Uja0bUDQFnCyW0FSXQsm0PUwFCF8MOPy35cJDhRPHbV4BLFLoE4KN
015rJwIDAQABAkBs8jrTFJdUMUWEh5c9rTSHPP0Y4FKCDtk6RcV4iEQ73nsRSZgZ
qXtwvtJEGIR72WJtL+jPpOowBstRGV+74QDBAiEA80HYptBwCfY9xIV1aUK3VDfg
4eRfAXWSnWtdo8l8TYcCIQDNPVvNn91yzPkWZfEnkxgJYuamsLVCAnHB1/XrUs1d
YQIgCUaSf1HlY8va8RpxrrDXksOKtLJjmQelrpEAghVVwxMCIH9q+4aiHEp8ZJv6
OAhYstCI/Sc5h55uhA9TMxKgumyhAiEA6fSY5n2XctKGcYPXEPakiD3uFmMWRGEy
xQSZ/Ta1IgE=
-----END PRIVATE KEY-----