Photo shows two spars, the one on the left has been trimmed to length and tapered.
Before the newspar/oldspar sandwich is unclamped (after drilling holes), trace around the wingtip end of the old spar with a pencil. Unclamp the two spars and set the old spar aside. Then using a carpenters circular saw carefully and slowly cut the taper in the end of the new spar,. You can make a precison cut with a circular saw by holding the guard open with your little finger and then watching the blade as it moves through the wood. The blade should remain on the waste side of the line and the cut should just barely touch the pencil line.
After cutting with the saw, dress the cuts smooth with a small block plane. Remember to plane in the direction of the grain, if you try to plane against the grain the plane will catch and rip out little chunks of wood. It's also possible to do the same thing with sanding block and some course sandpaper. It takes longer but you're unlikely to damage the wood.
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