(1) All the Acrobat icons (Reader, Standard, and Pro) are now white on red. The black was a very bad design mistake reviled by many if not most customers as well as a large number of Adobe employees. The black icon with no border was exceptionally hard to distinguish on dark backgrounds or with dark themes both with Windows and MacOS.
(2) Despite what you may be told or believe, you really should not have both Reader and either Standard or Pro installed in parallel on a single system, either of the same or different versions. Acrobat Pro is a superset of Acrobat Standard which is a superset of Reader. Having both Reader and either Standard or Pro installed can lead to significant “issues.” Going forward, expect that the installers will no longer allow such parallel installations.