Even though the Pitman shaft nuts are the same, the diameter of the Pitman shafts are different, hence the Pitman arms are different too. So the easier fix is to install the later idler arm.
If you do want to check the Pitman shaft diameter, you can get a Pitman arm puller from most auto parts stores and some stores like Autozone will rent 1 to you. You have to buy the tool, but you can return it for a full refund if you don't damage the tool.
If you have a choice of size, try a smaller Pitman arm puller 1st. IIRC, you might have to loosen and/or remove some of the steering box bolts to use even the smaller Pitman arm pullers as the frame is really close to the steering box.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502 hiperformanceautoservice.com or oldvolvosonly.com
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