Cockatiel which gender guess?

Hello everyone. I haven't had my cockatiel for long, and I haven't done a DNA test yet because he isn't tame or rather, he's still very timid. My male cockatiel gets along very well with the male and often tries to climb on him, but the male doesn't like it. Since he looks almost identical to my male, with only two differences: stripes on his tail and light spots on his back (see picture), and he doesn't want to mate, I think he's a male, right? Other characteristics include the bird singing more and louder. I don't know anything about this. I'm just curious. Serious answers only, please. Thanks.

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