I do see some similarities, but not enough to make the 99% claim:
- The font used in the navigation for both sites is the same (although one is bold and one isn't). Try Futura on the FHM site. That'll probably solve that issue and make it a closer match to the FHM logo font.
- Your font face and size are the same (Verdana, 1), but not that uncommon.
My personal advice to you would be not to give a damn what "pros" think, unless the "pros" are the ones judging the contest and paying you for the work. If you did both of these sites (and based on the style, I believe you did), then you've got nothing to worry about.
If anyone who can influence the outcome of the contest (e.g. a judge) makes the same comment, I'd cite the US court case involving the singer John Fogerty (formerly of the band Creedence Clearwater Revival, for those who might recognize the name). Back in the 80s, Mr. Fogerty was taken to court by the CCR record label in a plagiarism suit. The record label claimed that the song "The Old Man Down the Road" (from his solo "Centerfield" album) was a ripoff of CCR's "Run Through the Jungle".
Here's the kicker...Fogerty wrote both songs. So, in effect, he was being accused of plagiarizing himself. He actually had to play both songs in the courtroom before the lawsuit was dismissed.
You're basically in the same boat. Someone's accusing you of "plagiarizing yourself". You really can't do that.
(Side note: "The Old Man Down the Road" sounds a lot more like "Green River" and is written in the same key, so the plaintiff didn't even pick the right song.)