I think the K&L fat is tallow, the surface fats are suet. They have different properties.
Not according to Wiki.
"
Suet is the raw, hard
fat of
beef or
mutton found around the
loins and
kidneys. Suet has a
melting point of between 45 °C and 50 °C (113 °F and 122 °F) and
congelation between 37 °C and 40 °C (98.6 °F and 104 °F). Its high smoke point makes it ideal for
deep frying and
pastry production.
The primary use of suet is to make
tallow, although it is also used as an ingredient in cooking, especially in traditional puddings, such as British
Christmas pudding. Suet is made into tallow in a process called
rendering, which involves melting and extended
simmering, followed by straining, cooling and usually by repeating the entire process. Unlike tallow, suet that is not pre-packed requires
refrigeration in order to be stored for extended periods."
"Suet should not be confused with
beef dripping, which is the collected fat and juices from the roasting pan when cooking roast beef. Suet should also not be confused with all beef or sheep fat. It is normally the fat found around the heart and kidneys of cattle and sheep, and nowhere else in the animals."
"Pre-packaged suet sold in
supermarkets is
dehydrated suet. It is mixed with flour to make it stable at room temperature."