BlundstoneWomen's 1630 - High Top Boot 6.5 M Rustic Black

I need a wide shoe due to bunion on left foot. are the unisex sizes wider? do any styles come i. wide widths?

I have bunions on both of my feet, and have to stand for 8 hours a day. Would these be comfortable for me?

i already have a pair that is an australian 6.5 (in us sizes i am a 10). are these sold with the us or australian sizing system?

Many of the blundstone boot colors are described as "black." these are "voltan black." what's the difference in color?