Good Morning Deecee.... I think you are being too hard on yourself. I would count that as an exact match! Looks good to me..... Isn't it funny how quick we are to criticize our own work? Its a beautiful block and I love your colors!
When you stitched the central seam between the red and green sections, did you iron those seams open or did you press to opposite sides so you could lock the seam allowances together? I don't know which is best, but maybe get some scrap fabric and test both methods to see which way really is more accurate. .... (just a thought)
hugs, Jup