"Get" or "Grasp" stative or dynamic verb
In "Merriam-Webster" dictionary, the meaning of "understand" is as follows:

"to get the meaning of something / to grasp the meaning of something." Now my questions are below:

I don't understand your instructions.

1. Is it grammatically correct if I rewrite the sentences with present simple, using "get" and "grasp" verbs instead of "understand"?

2. Do these sentences above express the same meaning?

3. I know "understand" is a stative verb but is "get"/"grasp" a stative or a dynamic verb here?

Question

"Get" or "Grasp" stative or dynamic verb
In "Merriam-Webster" dictionary, the meaning of "understand" is as follows:

"to get the meaning of something / to grasp the meaning of something." Now my questions are below:

I don't understand your instructions.

1. Is it grammatically correct if I rewrite the sentences with present simple, using "get" and "grasp" verbs instead of "understand"?

2. Do these sentences above express the same meaning?

3. I know "understand" is a stative verb but is "get"/"grasp" a stative or a dynamic verb here?

Answer

1. Yes, it is.
2. Yes, they mean more or less the same thing, but whenever a word changes, there is a small nuance difference.
3. "get" and "grasp" are generally considered dynamic verbs as far as I know.

Many verbs are both dynamic and stative depending on in what sense they are used.  "understand" is also dynamic if used in the sense of "comprehend / get /grasp".  It's only stative when used in the sense of "know" or "have the knowledge".  So it's better not to have a too rigid notion of "stative / dynamic" as if each word can only be used in one way.