I’ve never been to a Catholic mass, nor have any desire to go, so I cannot speak about any “critical” difference or similarity between what I am familiar with (LCMS) and that.
Although I am Catholic, I have had the opportunity to attend a Lutheran Service (all LMCS) on several occasions for a wedding and baptisms of family members.
While there are differences, I was struck by the many similarities between the Lutheran Service and the Catholic Mass.
“While there are differences, I was struck by the many similarities between the Lutheran Service and the Catholic Mass.”
And this is the place we should start and end on! Our strength and foundation is in our common love for God and Christ.