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You asked about rings and valves as they apply to bus vs. 914. The rings are the same cost-wise, although the pistons are different. 1.7 (90mm) 914 pistons are dome top instead of dished. 2.0 pistons (94mm) are dished on both bus and American-market 914. Euro 914 pistons are flat top and are a popular upgrade to raise the compression a little and add a few HP. Valves are about the same cost-wise with the exception of 914 2.0 exhaust valves. These are sodium filled and go for $55-$60 each. The valve sizes are very different, though. A bus 2.0 head has smaller valves than a 914 1.7.
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