Nexus 93120TX - these more of DC switches, you need to use vPC if you looking to desing high availability.
Cisco 4500-X series - if you looking replace or looking to deploy Campus Lan - you need to consider Cat 9500 or Cat 9600 (high end) or Cat 9400 switches.
i would suggest to make a n small network diagram and in line with your goal - so community can suggest right product for you. or provide right direction of design.
So will it be possible we can use LACP between two switches and can they connected via 40Gbps multiple DAC cables ? - yes as long as the device support this cables and ports.