What is the difference between aneurysmal varix and varicose aneurysm?

No real difference: Both are aneurysms arising from varicose veins. The treatment is the same, with compression, followed by ablation or resection, or sclerotherapy.

The same: You are describing the same condition with both of those medical terms. Essentially both describe a "ballooning out" or aneurysm formation at a site of vein wall weakness that results from the underlying vein wall weakness & often underlying venous hypertension (from venous insufficiency). They can be painful, unsightly, and sometime lead to bloot clots at the site. Seek vascular surgeon consult

Interchangeable: These seem to be the same thing.

No difference.: "Varix" means "varicose vein" and "aneurysmal" is an adjective that means "like an aneurysm", so "aneurysmal varix" and "varicose aneurysm" are the same thing. One confusion may be that "varicose", "varix", "aneurysm" and "aneurysmal" all mean "dilated or swollen". But, by convention, an "aneurysm" is usually more localized. So, a long varix can have an even more dilated "aneurysmal" segment.