Unfortunately, you cannot, as the combined accounts must be of the same type. 

A single RMD withdrawal can be made to cover the entire required amount for the year.  However, the combined accounts must be of the same type.  For example, two traditional IRAs can be combined, not an IRA account and a pension account.  

If the accounts are combined, a taxpayer may take a withdrawal from any chosen account in the amount of the total required minimum distribution required for all accounts. 

https://www.irs.gov/Retirement-Plans/RMD-Comparison-Chart-IRAs-vs.-Defined-Contribution-Plans

Even if you have multiple 401(k) plans, each 401(k) must satisfy its own RMD.  The only types of accounts that allow aggregation of RMDs are IRAs, and separately, 403(b) plans.  (RMDs from inherited retirement accounts must also be handled separately from your own.)