Let $m$ be a positive integer. Find polynomials $P(x)$ with real coefficients such that $$(x-m)P(x+2023) = xP(x)$$
is satisfied for all real numbers $x.$
1. **Initial Setup and Substitution:**
   Given the equation:
   \[
   (x - m)P(x + 2023) = xP(x)
   \]
   we need to find polynomials \( P(x) \) with real coefficients that satisfy this equation for all real numbers \( x \).

2. **Case Analysis:**
   We will consider two cases: \( P(x) \equiv 0 \) and \( P(x) \not\equiv 0 \).

3. **Case 1: \( P(x) \equiv 0 \):**
   If \( P(x) \equiv 0 \), then the equation is trivially satisfied since both sides of the equation will be zero for all \( x \).

4. **Case 2: \( P(x) \not\equiv 0 \):**
   Assume \( P(x) \) is not the zero polynomial. We need to find conditions under which the given equation holds.

5. **Substitution and Zeroes of \( P(x) \):**
   - Substitute \( x = 0 \) into the equation:
     \[
     (-m)P(2023) = 0 \implies P(2023) = 0 \quad \text{(since \( m \neq 0 \))}
     \]
   - Substitute \( x = 2023 \):
     \[
     (2023 - m)P(4046) = 2023P(2023) \implies P(4046) = 0 \quad \text{(since \( P(2023) = 0 \))}
     \]
   - Continuing this process, we find that:
     \[
     P(k \cdot 2023) = 0 \quad \text{for all integers } k
     \]

6. **Polynomial Form:**
   Since \( P(x) \) has infinitely many roots (all multiples of 2023), \( P(x) \) must be the zero polynomial unless \( m \) is a multiple of 2023. Let \( m = 2023k \) for some integer \( k \).

7. **Constructing \( P(x) \):**
   - If \( m = 2023k \), then \( P(x) \) must have roots at \( x = 0, 2023, 2 \cdot 2023, \ldots, k \cdot 2023 \).
   - Therefore, \( P(x) \) can be written as:
     \[
     P(x) = c \prod_{i=0}^{k} (x - 2023i)
     \]
     where \( c \) is a non-zero constant.

8. **Verification:**
   - Substitute \( P(x) = c \prod_{i=0}^{k} (x - 2023i) \) back into the original equation to verify that it satisfies the equation:
     \[
     (x - 2023k)P(x + 2023) = xP(x)
     \]
   - Since \( P(x) \) has the form \( c \prod_{i=0}^{k} (x - 2023i) \), it follows that \( P(x + 2023) = c \prod_{i=0}^{k} (x + 2023 - 2023i) \).

9. **Conclusion:**
   The polynomial \( P(x) \) that satisfies the given equation is either the zero polynomial or of the form:
   \[
   P(x) = c \prod_{i=0}^{k} (x - 2023i)
   \]
   where \( m = 2023k \) and \( c \) is a non-zero constant.

The final answer is \( \boxed{ P(x) = c \prod_{i=0}^{k} (x - 2023i) } \) where \( m = 2023k \) and \( c \) is a non-zero constant, or \( P(x) \equiv 0 \).