I would like to know how close these two shafts are in spine?

I am shooting them from a cut to center 59# Keith Chastain recurve with a B50 string. The CX 250's are cut to 29.5" and have a 50 gr insert with a 200gr point they also have the nock insert with regular glue on nocks and no cap wrap. This combo bare shafts great out to 20-25 yards.

I recently got some gold tip trad 5575's cut to 29.5" already fletched with a cap wrap, 100 grain insert and the press in nocks. These shafts group right with the CX 250's with the same tip weight of 250 grains.

Is this coincidence or are they pretty much the same spine shaft?

Gold Tip 5575 is .400 deflection.
CX Heritage 250 is .387 deflection.

David