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Personally, my choice would be the one with CPU T6400. Memory can be upgraded in the future. You will need to check the max memory capacity that you have on the laptop that comes with CPU T6400.
Intel® Core™2 Duo Processor T6400 (2M Cache, 2.00 GHz, 800 MHz FSB)
It has a better cache size.
Unfortunately i could not find the CPU T4300 on the site ark.intel.com. Probably it may be an OEM version.
All the best,