Both the notebook using the same aluminum enclosure, using the same dedicated VGA, the same click the button below their touchpad. But there are differences:

	Macbook 13″	Macbook Pro 15″
VGA	NVIDIA GeForce 9400M graphics processor with 256MB of DDR3 SDRAM shared with main memory	NVIDIA GeForce 9600M GT graphics processor with dual-link DVI support; 256MB of GDDR3 memory on 2.4GHz configuration; 512MB of GDDR3 memory on 2.53GHz and 2.8GHz configurations NVIDIA GeForce 9400M graphics processor with 256MB of DDR3 SDRAM shared with main memory
Display	13.3-inch (diagonal) LED-backlit glossy widescreen display with support for millions of colors	15.4-inch (diagonal) LED-backlit glossy widescreen display with support for millions of colors
Resolution	1280 by 800 (native), 1152 by 720, 1024 by 640, and 800 by 500 pixels at 16:10 aspect ratio; 1024 by 768, 800 by 600, and 640 by 480 pixels at 4:3 aspect ratio; 720 by 480 pixels at 3:2 aspect ratio	1440 by 900 (native), 1280 by 800, 1152 by 720, 1024 by 640, and 800 by 500 pixels at 16:10 aspect ratio; 1024 by 768, 800 by 600, and 640 by 480 pixels at 4:3 aspect ratio; 1024 by 768, 800 by 600, and 640 by 480 pixels at 4:3 aspect ratio stretched; 720 by 480 pixels at 3:2 aspect ratio; 720 by 480 pixels at 3:2 aspect ratio stretched
Processor	2.0GHz or 2.4GHz Intel Core 2 Duo processor with 3MB on-chip shared L2 cache running 1:1 with processor speed 1066MHz frontside bus 2GB (two 1GB SO-DIMMs) of 1066MHz DDR3 SDRAM; two SO-DIMM slots support up to 4GB	2.4GHz Intel Core 2 Duo processor with 3MB on-chip shared L2 cache running 1:1 with processor speed; or 2.53GHz or 2.8GHz Intel Core 2 Duo processor with 6MB shared L2 cache 1066MHz frontside bus 2GB (two 1GB SO-DIMMs) or 4GB (two 2GB SO-DIMMs) of 1066MHz DDR3 SDRAM; two SO-DIMM slots support up to 4GB
Keyboard	2.0GHz MacBook Built-in full-size keyboard with 78 (U.S.) or 79 (ISO) keys, including 12 function keys and 4 arrow keys (inverted “T” arrangement) 2.4GHz MacBook Built-in full-size illuminated keyboard with 78 (U.S.) or 79 (ISO) keys, including 12 function keys and 4 arrow keys (inverted “T” arrangement)	Built-in full-size backlit keyboard with 78 (U.S.) or 79 (ISO) keys, including 12 function keys and 4 arrow keys (inverted “T” arrangement)
Harddisk	2.0GHz MacBook 160GB 5400-rpm Serial ATA hard disk drive Optional 250GB or 320GB 5400-rpm hard drive or 128GB solid-state drive 2.4GHz MacBook 250GB 5400-rpm Serial ATA hard disk drive Optional 320GB 5400-rpm hard drive or 128GB solid-state drive	250GB or 320GB 5400-rpm Serial ATA hard drive Optional 250GB or 320GB 7200-rpm hard drive Optional 128GB solid-state drive

Some of Apple Product Lovers may be disappointed that some features removed by Apple in the Macbook, such as Firewire, and the use 15.4-inch (diagonal) LED-backlit glossy on Macbook Pro. But this is covered by the increased speed and performance of all the range of Apple products with the same price of the product ever.

The last 5 years I can only observe the products of Apple, without able to buy them.