Size(for both):
13 to 15 hands; 750 to 1,000 lbs.
Reaches full maturity at 7 to 9 years.
Gaits will be smooth and comfortable, whether lateral or diagonal.

Color(for both):
Many colors including but not limited to bay, black, blue corn, brown, buckskin, chestnut, dun, gray, grullo, ysabella, palomino, roan and white.
Color patterns include appaloosa, tobiano, overo, Medicine Hat, War Bonnet, calico, sabino, frame and splash paint plus many variations.

CONFORMATION(for both):
Nostrils are elastic, crescent-shaped with roomy nasal cavity, allowing for large extension and ample air intake.
Eyes are set low and wide; bone over the eye is heavier and more protruding than modern horses.
Ears are fine and narrow, often hooked on the tips.
Neck is muscular, but not coarse or short.
The head is attached to the neck with a cleanly arched throatlatch.
Shoulder will be strongly angled and well-laid back.
Back is short, often with one less lumbar vertebrae; 5th and 6th lumbars are usually fused if the 6th lumbar vertebrae is present. 
The shorter backed horse may have one less pair of ribs.
Neck, back and hip are approximately the same length.
Loins are deep and strong.
Barrel is well-filled with long underline; narrow front and rear.
Tail set will be low and hip more deeply angled.
Legs are well-boned with large, strong joints, tendons and ligaments. 
Structurally, bone will be dense, hoof wall thick and cannon bone round rather than oval. 
Small 'chestnuts' or 'ergots' on inside of legs.
Feet are compact, comparatively rounded, elevated with thick, dense walls.
head can be straight(for both) Convex(colonial spanish, rarely Am. Mustang) or Concave(Am. Mustang)

Colonial Spanish Approved Strains Include:

Brislawn Foundation
Original Horse of the Americas Foundation
Book Cliffs
Tribal
Havapai Pony
Abaco Barb
Banker Horse
Carolina Marsh Tacky
Cerbat
Florida Cracker
Kiger
Nokota
Pryor Mountain Mustang
Spanish Barb
Sulphur Springs Horse
Sorraia
Chincoteague Pony

The Colonial Spanish Horse is a Horse of Spanish Type, this includes Most Mustang Strains & Breeds as well as Spanish Barbs, Do to the fact that the Game generated Wild Horses can be of any EA breed or a random crossbred, as such all Spanish Breeds can apply for CS Registration even if they do not meet their breed standards. All Mustang Strains& breeds are accepted as American Mustangs, EA's American Mustang Template is accepted & considered Ideal for mustangs of warmblood type, although draft & hotblood types will be accepted. Any "wild" Horse in the Sims will be accepted as well as any horse being used in a wild setting as a feral horse/wild mustang regardless of breed or registration as the mustangs conformation varies greatly. Most Breeds we consider purebred, started out as wild mustangs, the Quarter Horse is one of those breeds not only do they carry the Spanish blood of the Andalusian/Lusitano but they also got their start in the wilds of North America.