Matucana polzii ?

Matucana polzii Diers et al., Kakteen And. Sukk. 37:114. 1986 ?; 
 

 
https://08511630493324166816.googlegroups.com/attach/c2b634453a8fd0e0/DSCN2257.jpg?part=0.1&view=1&vt=ANaJVrH12U2pqgBV-LxnbzQVk_5UK0yg6iNf1na8gZxQe14lYiEr_kLX_k_EClTy9Rv2K6O5JVEVq28Vrgy0KS7_t6uwxYwQWmm-nll35lCdV1hAeJ4lKVQ
https://08511630493324166816.googlegroups.com/attach/c2b634453a8fd0e0/DSCN2257b.jpg?part=0.2&view=1&vt=ANaJVrHGBv59dDFObsCun4gzhbzx9pz3JUms6_O8drLFkzni-bWMdc33LMuw0Ds4gOpX_K6p9whwmb6Y5E59vLlG7JTlltzdSKdxz2Y3yiFYDQLBBRceP5I
 
Duars : cactus-03 : Notocactus sp. ? : 4 posts by 2 authors. Attachments (2).  
This cactus looks somewhat similar to
Looks like Matucana probably polzii the flower is zymorphic so not notocactus.
Thank you very much once again, for the ID and explaining the difference.
  

References:

GRIN  The Plant List Ver.1.1  Tropicos  

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