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I believe the op is asking if the newer Ultegra chain must use the quick link or can be joined with the connecting pin that was used prior to Shimano moving over to quick links. So obviously either may be used.
As to why, without a quick link set of pliers the Shimano quick link is a royal PIA compared to the SRAM version.
The Ultegra chain is my preferred chain, the best bang for the buck. I always used the connecting pin but recently switched to using the KMC missing link. Easier to snap into place and take apart than the Shimano and feels more secure than the SRAM version.
( not indicating that a SRAM QL can be used with Shimano. Must use SRAM w SRAM, Shimano w Shimano, KMC QL with either )
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