Quartus II and megacore license

good question.

i had a similar problem and the first thing what my FAE did was to equalize them with the next renewal ....

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(1) Creating a megacore with 9.1 and compile the design with 9.1sp1

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Yes this should work some megacores like FIR copy the required files and add the relatives paths to the QIP file, so i have some FIRs for example that are updated last time with 9.0 and still compile with 9.1SP1 without a 9.0 installation.

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(2) Creating a megacore with 9.1sp1 and compile the design with 9.1sp1

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i think SP1 is a service pack (bug fixes) of an existing funktional version 9.1 so it should be part of the licence as 9.1 was released before 2009-12.

but that is my opinion and experience with different software, a service pack is not a new release