Can vascular osmotic pressure ever change?

[enervate]

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I came across a couple of helpful posts in an old thread about osmotic and hydrostatic pressure earlier today:

The hydrostatic pressure drives the material out of the capillary, while the osmotic pressure brings the material back to the capillary.

Hydrostatic pressure is more than osmotic pressure at the artery side, so overall things get out of the capillary. At the venule side, osmotic pressure is higher than hydrostatic pressure, so 90% of the stuff gets back to capillary. the 10% leftover is what gets back to the left subclavian artery by the lymphatic ducts.

Osmotic pressure is constant, and NOT higher at the venous side. This is a typical mistake. I have also seen a lot of questions about this subject on many bio tests. It's good that the person who asked the question brought this up.

The above post states that osmotic pressure is constant. Two questions based upon that statement:

(1) Can the osmotic pressures of distant tissues be different? If so, please explain.

(2) Constant osmotic pressure only refers to the osmotic pressures within one person, correct? Shouldn't it be possible for two individuals to have different osmotic pressures?