They cost about the same. There's a few differences, like some better tech--also some worse tech, like preferring lasers and CPUs over older cheaper techniques that also work better[1]. There's more regulation too. And wages have swung upward and downward in the intervening time, right now we're barely past the bottom of the cycle[2] of the relationship between leaf-node employee wages and everything else.

But the real difference is that official inflation is a lie. Inflation since 1970 is closer to 38x (candy-jar guessing), not 7.25x. So the costs of construction are pretty similar.

[1] So once upon a time, to create a level line, and in Latin America to this day, you fill a clear hose held up in a U-shape with water up to a foot from the top on either end. Hold one waterline up to the mark that marks the height you want for the level line. Then extend the other end out to the wall you want the level line to extend to. The waterline will be at the same height on either end. Mark it. That's the endpoint of the level line. Costs like three dollars for the hose and that hose lasts indefinitely unless it is damaged, by getting stepped on pretty much not due to any other reason. Whereas apparently in USA there's laser levels that have all these buttons and a manual and a CPU and data and...yuck. And it starts at $29.99 for the basic model, of what I can tell--you can't look up prices online anymore much because they're tailor in many cases. That's what I think that crappy product costs--that's the "price point" they target. Plus there's price discrimination and rebates, points, programs, whereas with the clear hose you're clearly not getting hosed.

[2] Since about the seventies--a time when I daresay managers were underpaid--there has been opposition at multiple different levels against leaf-node employee wages. From opposing the minimum wage, to promoting immigrant arrivals who rarely manage anybody when they arrive, to busting unions and strikes, to right-to-work laws, plus noncompetes for the likes of sandwich makers, plus SCOTUS making paying union dues destined for political speech optional (but no such luck for the part of the price for a good that corporations destine for political speech), to women entering the workforce (more leaf-node competition, they don't start out as management), to college becoming impossible to pay for as a leaf-node worker, then endless distortions in the housing market to make rent a third of income (this is by design, it can just as easily be a tenth), plus the erosion of safety nets...it's a subject unto itself, but leaf-node wages are heavily opposed in America. After IIRC their peak in 1978, 44 years ago, they are coming back up from the trough. Tying it back to the subject of inflation, leaf-node wages are considered inflationary in a way that other wages are not. And according to the BLS, inflation and leaf-node wages are the sameself thing.

EDIT: I forgot the other main ingredients of inflation: commodities, cars and computers. Commodity prices are also strongly opposed politically, corporately, and "mediatically." Cars and computers are not politically opposed--on the contrary, they're good, that's why they're included, to make inflation look smaller, look it up on http://www.shadowstats.com.