Filter to next smaller value (i.e previous version)

You want “previous visible version” (i.e., the next smaller version after all slicers/visual filters are applied).
Use ALLSELECTED (or no ALL at all) so the measure respects what’s currently visible.

1) Previous visible version (ID)

Previous Visible Version :=
VAR cur = SELECTEDVALUE ( 'Dim Version'[version] )
RETURN
CALCULATE (
MAX ( 'Dim Version'[version] ),
FILTER (
ALLSELECTED ( 'Dim Version'[version] ), -- keep slicers/visual filters, drop row context
'Dim Version'[version] < cur
)
)

• If 2503 is filtered out, for row 2504 this returns 2502.
• If there’s no smaller visible version, it returns BLANK().

Simpler equivalent (often works the same):

Previous Visible Version :=
VAR cur = SELECTEDVALUE('Dim Version'[version])
RETURN CALCULATE( MAX('Dim Version'[version]), KEEPFILTERS('Dim Version'[version] < cur) )

(This version relies entirely on current context; if you have cross-highlights affecting context, prefer the ALLSELECTED one.)

2) Variance vs previous visible version

Assume your main measure is [Amount] (sales, qty, etc.).

Variance vs Prev Visible :=
VAR prevVer = [Previous Visible Version]
RETURN
IF (
ISBLANK ( prevVer ),
BLANK (),
[Amount]
- CALCULATE ( [Amount], 'Dim Version'[version] = prevVer )
)

3) Tips

• If versions aren’t numeric, replace comparisons with an order column (e.g., 'Dim Version'[Order]) and return the corresponding version via LOOKUPVALUE.
• For ties/duplicates in the version column, ensure there’s a unique order key.
• Want the previous visible value directly (not the ID)? Do:

Prev Visible Amount :=
VAR prevVer = [Previous Visible Version]
RETURN IF ( ISBLANK(prevVer), BLANK(), CALCULATE([Amount], 'Dim Version'[version] = prevVer) )

Drop these into your model and your matrix will always step back to the next smaller version that’s still visible.

I hope it will help.