Measure either if they fit good and snug. Should be able to push the pin in the axle by hand or light taps with a mallet but will not fall out.
If sloppy in the axle measure the bore to see if metal is available to ream for an oversized kingpin to solve the problem.
If really sloppy enough that oversize kingpin can't be fit you replace the axle.
Pretty sure there is just standard size and one oversize which is likely 0.010" over. Have you checked to see what is available?
