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Question DDR4 RAM mixing same brand but different frequency and timings?

Makes no difference if it's the same brand and sometimes same specs can fail. Mixing is trickier with ddr4 than older generations. There's no definite answer if it'll work, it's not a definite no, but trying it is the only way to find out. Every system is different so googling experiences won't be 100% same for your system.

See section dual channel with three sticks for dimm placement. https://www.intel.com.au/content/www/au/en/support/articles/000005657/boards-and-kits.html