Inter-changeable downpipes with BMW B58 340i/ 440i

[SupraCal]

I have seen websites selling after market downpipes marketed as suitable for the supra/ BMW 340/ 440.
Does that mean all these models/makes are inter changeable? even for stock DP?

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[Extreme Power House]

Not sure about stock but all the aftermarket downpipes we sell are interchangeable