Exhaust manifolds from a 1994+ magnum

So I bought some manifolds that I thought were the two and 1/8 in outlet opening but they turned out to be the later model 94 and up exhaust manifolds. The guy advertised them as the early model manifolds with the two and 1/8 inch opening which I already had one of which I am going to use on my 68 Barracuda I have the driver's side 340 exhaust manifold so I am just going to use the bigger 2 1/8 Magnum one on the passenger side. But the other two I bought thinking they were the 2 1/8. But unfortunately they are the 1 7/8 and I was going to use them on a Ramcharger I'm just curious how well these flow compared to what would have come stock on an 81 360? I think they are referred to as log style?
I thought they looked a little small when I picked them up but I was in a rush and picked them up on my way home after work only to realize when I got home that they were not the correct ones, lesson learned.

The 2 1/8 manifold casting number is 53009376
The 1 7/8 are 53010186 and 53010187

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