Comparing test scores across multiple forms depends on test parallelism or test equating. New Rule 3. Comparing test scores across multiple forms is optimal when test difficulty levels vary between persons. No - the emphasis has shifted. The goal is no longer to match the new test to the old test, it is to match the new test to the new person.
Item banks are the key.
Unbiased Assessment of Item Properties. Old Rule 4. Unbiased assessment of item properties depends on representative samples from the target population. New Rule 4. Unbiased estimates of item properties may be obtained from unrepresentative samples.