They're quite a bit different actually. Regular e46 has a totally different control arm than xi. The bushings on an xi have a round hole in the center to accomodate a round arm and the e46 325i bushings have a hexagon type hole. Lastly the e46 325i bushing comes already in a housing. The xi bushings are pressed in and out of the housing which coincidentally is the identical housing for an e30 325.
Sorry for the bad news.
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