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First of all, the mitigation of INTEL-SA-00086 requires updated firmware for the intel Management Engine (ME) whereas the mitigation of INTEL-SA-00088 required microcode changes (for SpectreB) and Operating System changes (for SpectreA and Meltdown).
Some manufacturers chose to release the updated ME firmware in a separate package that updated only this firmware. Other chose to release the updated firmware and microcode in a single (BIOS) update package. Now, considering the differences in the timing of the updates (INTEL-SA-00086 in 11/17 and INTEL-SA-00088 not until 04/18), it is possible that the updates were released completely independently. Ultimately, however, since most manufacturers package ME firmware, microcode updates and BIOS updates in a single package, once you saw a BIOS package with the microcode updates in it, you also saw the ME firmware update in this same package. You would also see this same ME firmware included in every BIOS release until such time as another ME firmware updates comes along.
Hope this covers it,