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What you've heard is true. They are very much alike and at the same time very different. The cylinder bore centers are the same and head bolt pattern is identaical so the heads will interchange but the valve covers and bolt holes for t belt covers are not the same so belt cover fit is iffy. The water pumps aren't the same but the oil pumps are.
The engine seals are the same as are intake and exhaust gaskets. No bearings (except intermediate shaft), nor rods nor crank is the same.
The t belt is the same. The blocks are different.
The B230 is a modernization of the engine family. The roots of this engine go back to Belinders-Monktell tractor engines of many moons ago. The B21/23 engine shares some pieces and dimensions of the B18/B20 version which shares some pieces and dimensions of the B16 which shares some pieces and dimensions of the B14. I think if you go back earlier than that you have to look in a tractor museum in Sweden.
The changes to the RED motor to transform it from a B21/B23 into the B200/B230 are all primarily to lessen unneeded weight from earlier, wasteful foundry methods and to reduce friction primarily through lowered reciprocating mass. The B21/23 engine was mostly english dimensioned and the B200/B230 is metric. The B200/230 has two crank versions intro up to 1988 has smaller mains with half circle thrust bearing inserts on center main journal. The version after this got larger mains (63 mm replacing 55mm) with flanged main brg on rearmost crank journal to control thrust.
I could go on but Regis just told me that was my final answer........
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