I'm not a pagan (or at least I don't consider myself one) but I have been shoulder surfing today. My first comment is very simple:
Historical providence matters none to the non-conventional spiritual movements. They don't need a two-thousand year lineage to determine their path. What works for someone is not determined by 'the word' of others in this instance so past history is irrelevant.
Second:
Practical Wicca shares elements with western occultism simply because it works. A Wicca as very much as likely to practice candle magic, the same lesser banishing ritual, and other practices just the same as I. But, none of these are practices required to be a Wiccan. The OTO didn't invent anything but a few reasons to trap some rubes into homo-erotic encounters. (Not that I have problems with homosexuals!) What you confuse with identification really is just the fact that Wicca didn't need to reinvent hammers, screwdrivers, and nails. All of these commonalities are similarities in the toolbox nothing more. Gardner didn't reinvent what worked, and much like others before him used what he found already effective.
The worst stealer, and borrower BTW is Crowley. Crowley created nothing new or original, but rather repackaged and stamped his name on it. He's the proverbial quirky magus, but also horrible with innovation. Great at compilation, trail, and promotion however.
The common lesser banishing ritual of the pentagram comes from at least as old as Eliphas Levi (probably existed even earlier!), candle magic has been done since ancient times, as has divination via gazing or scrying. Sex magic (which OTO loves) really has it's raw roots in eastern Tantra which existed thousands of years before OTO existed. Not saying they aren't doing anything worthwhile, but certainly they are ripping off their predecessors as much as anyone else.
Third:
Wicca is a faith. It exists nearly entirely outside of any particular ritual practice per say. Much like a Catholic is still Catholic when they do not attend mass. It's the belief in a particular divine hierarchy that defines a religion. Different groups don't use the same ritual or mystical processes in all cases, but there are several common traits across the whole group.
Fourth:
I am not a Wiccan, but I have studied the origins of most of these practices. Feel free to add if you find anything missing or in error.