Mouser has a great (hardware) comparison.
The links on the BBGW documentation pamphlet are mostly wrong, but you can find the BBGW wiki here (worth a visit).
Brief recap of differences between the BBB and BBGW hardware: HDMI is gone along w/the 5V barrel jack. USB connector has gone from mini to micro, and if you need 5V it must be injected via the P9 header. The RJ45 (ethernet) connector has been removed, put there are now bluetooth and WiFi radios. There are now 4 USB ports which are tall and will interfere w/most capes.
There are dedicated images for the BBGW and any Debian reference (within this post) is tied to bone-debian-8.6-seeed-iot-armhf-2016-11-06-4gb.img
The BBGW I2C bus maps i2c-0 and i2c-2 while BBB maps i2c-0 and i2c-1. Expect this to be an issue when migrating applications from BBB to BBGW.
BBGW $SLOTS is at /sys/devices/platform/bone_capemgr/slots.
BBGW $SLOTS is at /sys/devices/platform/bone_capemgr/slots.
root@beaglebone:~# cat $SLOTS
0: PF---- -1
1: PF---- -1
2: PF---- -1
3: PF---- -1
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