135e or 115e designate the subsystem ID of the network adapter. 8086 is the subvendor ID, which is Intel.
135e is the subsytem ID for the Dell version of the Intel® PRO/1000 PT Dual Port Server Adapter.
115e is the subsytem ID for the Intel retail version of the Intel®) PRO/1000 PT Dual Port Server Adapter.
Having the Dell version verus the Intel retail version should not affect any functionality.