Have you got a source that confirms the wreckage of two seperate weapons was found? When you say two different guns do you mean independent artillery pieces or just different barrels?

How many 800mm Railway Guns did Germany build in WW2?

I’ve been looking around for a while and I can’t find two sources that agree on anything, I’ve already posted in the ask subreddits. Hoping someone can point me in the direction of any useful information!