This is a great example of a Watchtower doctrine that has absolutely no scriptural backing. Not to mention the whole concept of Watchtower resurrection doctrine makes no sense.
The Watchtower teaches that when any human dies they cease to exist. The Watchtower teaches those Jehovah plans on resurrecting "live in His memory". Memory is memory; a token of the real thing. Ceasing to exist means you are not in any form or fashion. Therefor any person "resurrected" is a facsimile of the original person, regardless of what the body's appearance is, and is not the actual person.
In order for a person to be resurrected their essence or soul would have to be eternal and put into a new body. That sounds more like Hindu reincarnation than it does Christian resurrection. Especially if the body your essence is put into doesn't even look like you.
So the countless millions who are to be resurrected are more like a Watchtower version of Invasion of the Body Snatchers. It looks like you. It sounds like you. It has your memories. It's not you!