Here is a nice side by side comparison courtesy of PhoneArena.com
Samsung GALAXY Note 10.1 (2014 Edition) vs Google Nexus 10 - Phone specs comparison with the biggest differences are for the processor, memory, graphics being the biggest ones. Since the new Nexus 10 is yet to be announced, likely in a few weeks it will be interesting to see what it has in it.
HARDWARE
System chip
Qualcomm Snapdragon 800 MSM8974 Samsung Exynos 5
Processor
Quad core, 2300 MHz, Krait 400 Dual core, 1700 MHz, ARM Cortex-A15
Graphics processor Adreno 330 ARM Mali-T604
System memory
3072 MB RAM (Dual-channel, 800 MHz) / LPDDR3 2048 MB RAM (Dual-channel)