Easiest way to differentiate the B23 and B230: the valve cover. The B23 has a silver/metallic Valve cover with "VOLVO" in raised lettering. The B230 has a black valve cover with "VOLVO" in silver lettering.
The B21 looks like the B23, except that it is a slightly smaller motor (2.1L as opposed to 2.3L) and has a different intake manifold.
If it is still there, the engine model number should be printed on a sticker on the top timing belt cover. Also, the number is embossed on the passenger side of the block, below the oil filter.
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