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Unfortunately not no.
All Brokers and RDSH servers should be on the same core version, you can't have a mix.
However, if your secure gateways were completely independant servers with no other vWorkspace role installed, you could leave them both on version 7.6 whilst you upgraded the main farm (brokers & RDSH) or upgrade the SSL gteways first to 8.0.1, then the main farm to help acheive a 'staged' upgrade.
I hope this helps.