Hello Marcin.
Understanding Switch Stacks
A switch stack is a set of up to nine stacking-capable switches connected through their StackWise Plus or StackWise ports. You can connect only one switch type in a stack, or you can connect a mix of Catalyst 3750-X, Catalyst 3750-E, and Catalyst 3750 switches in the stack. Catalyst 3750-X and Catalyst 3750-E stack members have StackWise Plus ports, and Catalyst 3750 members have StackWise ports. The stack can have one of these configurations:
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Homogeneous stack—A Catalyst 3750-E-only stack with only Catalyst 3750-E switches as stack members or a Catalyst 3750-X-only stack with only Catalyst 3750-X switches as stack members.
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Note
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For example, a stack with Catalyst 3750-X and 3750 switches supporting the IP services features.
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For example, a Catalyst 3750-X-only stack with some members running the IP base feature set, other members running the IP services feature set, and the remaining members running the IP services feature set.
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For example, a stack with the Catalyst 3750-X members running the IP services feature set and the Catalyst 3750 members running the IP services software image.
For information about Catalyst 3750 switches, see the "Managing Switch Stacks" chapter in the Catalyst 3750 Switch Software Configuration Guide.
One of the switches controls the operation of the stack and is called the stack master. The stack master and the other switches in the stack are all stack members. The Catalyst 3750-E stack members use the Cisco StackWise Plus technology to work together as a unified system. Layer 2 and Layer 3 protocols present the entire switch stack as a single entity to the network.
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The stack master is the single point of stack-wide management. From the stack master, you configure:
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A) Correct. SW version should be the same on both however if the feature set is the same on both and are version differences, the switch stack will attempt an auto-upgrade process.
B) Of what I understand, if the feature sets are the same, then yes. With different feature sets, no. (this is how i've interpreted the document)
With regards to SW versions. As long as the major version and minor version is the same. The universal image comes with full features but enables certain features on a license basis.
Hope this helps
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