The first time I encountered this eerie similarity was when I put up a research regarding the similarity of INC and mormon architecture (http://pasugo-1914.blogspot.com/2008/09/felix-manalo-and-mormons.html). I asked an INC I know what the name and function of the tent-like structure because I wasn't content with just referring to it as "the tent-like structure" to desctibe what's behind the INC temple. I was surprised to find it named exactly the same as the Mormon structure I was comparing it with. Well, the similirities, as it turned out does not stop there.
Height 22.5m (73.8 ft)
No. of Columns: 48
Seat Capacity: 4000
No. of Columns: 44
Seat Capacity: 8000
Now, see how INC describe their Tabernakulo:
and compare it with how LDS describe theirs: