A duplicate must be same size and file type.
Same movie in different formats are allowed ...

MP4 and M4V are the same file type - the extensions are interchangeable.

Post at your own risk - but, unless you make a habit of it, I don't hear any complaints about mods punishing people who post dupes. So, I don't think there's much "risk"

I have a movie with the next data.
Duration - 02:07:19
Size - 3.63 GB
Aspect Ratio - 1628x880
kbps - 4091
Format - M4V
Subs - English + Portuguese

And I changed it to.
Duration - 02:07:19
Size - 3.63 GB
Aspect Ratio - 1460x790
kbps - 4500
Format - MP4
Subs - English

Does it count as a duplicate because the size is the same? or doesn't because I changed the fromat, the aspect ratio, the kbps, and the subs.

According to the rules: https://www.gaytor.rent/rules.php#102
that would be a duplicate... However, a Mod told me once (when I uploaded a potential duplicate) that ADDING Subtitles to non-porn videos counted as NOT a duplicate...

But, in the example above, you REMOVED subtitles. So it's a dupe.
Just another note: Mods DO care about subtitles, they DO NOT care about pics added to a torrent - so if you upload a torrent that is a dupe, but you added 1000 pics to the torrent, it is STILL a dupe!

NOTE: This is MY UNDERSTANDING of the rules... to get an OFFICIAL "ruling" you should post something in the Help Desk. (On the Torrent side of the site, under Support)