PWS31A1 has the following specifications:

the maximum charge voltage can be adapted to suit the type of battery being charged

Max Pull Load 550kg (1212 lb)

DH230RCL21

but with the added benefit of a much lower amp draw with minimal heat

Vetus P102825 - HRC-FF 8mm 5/16" 12V Motor PWS31A1 has the following specifications:The sleek, compact HRCFF 6 7 8 are Maxwells horizontal versions of the latest innovative vertical RC6 and RC8 automatic rope chain windlasses. The HRCFF Series are packed with original and proven features including patented rode management technology developed by Maxwell. Features and benefitsActivate the up control and the free fall device automatically disengages allowing you to power up your anchorAesthetically pleasing above deck design,