are my new additions bristlenoses or common plecos

I recently bought two bristle nosed catfish and would like help fish shops are crap(sorry) and lie as they have do so a few times to me and my partner. we bought before a albino bristle nosed catfish who grew to 7 inches in our tank and another 3 inches then sadly died in my partners dads tank. my little ones are maybe two inches and one is bigger than the other they are black with white spot and a white tipped tail, they have maybe doubled in size since we got them almost a month ago. Also what sex my they be.
hope someone can help.

welcome mate,

I'm afriad without a pic it is nearly impossible as there are several types that fit that description

To be fair to some fish shops it is virtually impossible to identify many small Plecostamus, Ancistrus, Panaque & similar species from one another when young.

Likewise I suspect some wholesalers sell young fish to retailers as a small variety who in good faith sell them on.
Its the end consumer like us who buys a young fish only for it to grow into a monster !

I have purchased really cheap Common Plecs for them to turn out to be a really nice colour variety including a Royal Plec that I bought for £1.50

hi thanks for your help will try and get a photo of the little nippers and post it for you to look at, thanks again for you help.