PB ID problem

Hey everyone,can any experts tell me what this is? Thanks!
6cm now, baby cellaris or orinocensis ?

I think they are not orino's because of the shape of lateral bar is longer and thicker, not close to round shape. They are labeled as WC tem's in Taiwan market. But I think they are definitely not tem's. Why would u guys think they are mono? Is that because of the head shape looks taller, or is there any other identification clue? I get very confused about distinguish a mono from a ocellaris. Can u tell me how u do it and what's the definite identification clues? Very appreciated.....