An acute triangle has all angles less than 90 degrees. Nothing is said about the sides; it may or may not have sides that are congruent.
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there are only two sides.
An acute triangle may have three, two, or no congruent sides.
If the figure has only four sides all together, then it's not possible for all four angles to be acute.
They both have 3 sides but an isosceles triangle has two equal sides whereas an acute triangle with different acute angles has no equal sides and is said to be a scalene triangle, or an acute triangle with three equal acute angles (of 60° each) and three equal sides is called an equilateral triangle.
Only when it has 3 unequal acute angles and 3 unequal sides that it is then a scalene triangle.